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04-18-2013, 07:16 PM
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#1 |
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Registered User
Join Date: Apr 2013
Location: Van Alstyne, Texas
Posts: 2
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factory tach and HEI
is it possible to run a later HEI with a msd 6a and the factory tach.
Thanks in advance |
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04-19-2013, 10:47 AM
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#2 |
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Registered User
Join Date: Aug 2006
Location: Athens, Georgia
Posts: 1,458
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Re: factory tach and HEI
Usually no, early tachs can not be used with modern electronic ignitions.
AutoInstruments in Virginia can convert them to work with HEI. -Brad
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'61 Suburban daily driver: off the road due to 180-pound 8-pt buck! '62 K-10 long-step project '61 C30 Camper, aka "Valdez" There's no cool like Old School |
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04-20-2013, 10:18 AM
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#3 |
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Registered User
 
Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: factory tach and HEI
There is definitely differing opinions on this:
http://67-72chevytrucks.com/vboard/s...d.php?t=518458 If it were me, and because you're running a MSD 6A, I would put an in-line filter in just for added protection and I am one who believes that it provides a better, more accurate signal, to the tach. When GM came out with the HEI in the mid-70s, even they figured that a filter was necessary. All of the GM cars with HEI and a factory tach had filters. You can find this filter on ebay for pretty cheap. Here's an example of what a used one looks like: http://www.ebay.com/itm/82-83-84-85-...3e38f9&vxp=mtr
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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12-12-2013, 08:57 PM
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#4 |
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But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: factory tach and HEI
Anymore info on this topic?
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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12-12-2013, 09:14 PM
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#5 | |
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Registered User
Join Date: Apr 2012
Location: Solvang, Ca 93463
Posts: 323
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Re: factory tach and HEI
Quote:
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